diff --git a/mie/trait/trait-definition.c b/mie/trait/trait-definition.c
index 6f4f34b..3d6041a 100644
--- a/mie/trait/trait-definition.c
+++ b/mie/trait/trait-definition.c
@@ -10,6 +10,8 @@ struct mie_trait_definition *mie_trait_definition_create(
 		return NULL;
 	}
 
+	memset(out, 0x0, sizeof *out);
+
 	out->tr_name = b_strdup(name);
 	if (!out->tr_name) {
 		free(out);